Printing roller



J. STEPHENSON PRINTING ROLLER March 4 1924.

Fiie'd April 23. 1923 .5 J'ZPpkm-mn Q Q 7112mm- Q M (TH/www- Patented Mar. 4, 1924.

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JAMES STEPHENSON, OF AUGUSTA, M

PRINTING ROLLER.

Application filed April 23, 1923. Serial N 0. 634,099.

To all whom it may concern:c

Be it known that I, JAMES STEPHENSON, a citizen of the United States, residing at Augusta, in the county of Kennebec and State of Maine, have invented certain new and useful Improvements in Printing Rollers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to improvements in printing rollers and more particularly to what are known as inch rollers in which knurled rings of t in metal are carried by the rollers for the purpose of pulling the paper through thepress.

These knurled rings or the corrugations must be replaced.

-As at present constructed, this necessitates stopping the press, takin the entire roller out, removing the knurle ring and substituting a new one and all of this involves loss of time and entails considerable expense.

It is an object of the present invention to provide an improved construction of pinch roller and shaft in combination with an improved form of the knurled ring whereby 80 the ring may be readily replaced without dismounting the roller and without in- I volving any but a very short delay.

With the foregoing and other objects in view, the inventlon will be more fully described hereinafter, and will be more particularly pointed out in the claim appended hereto.

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views:

Figure 1 is a side view of an improved printmg roller constructed according to the present invention.

Figure 2 is an enlarged fragmentary section therethrough.

Figure 3 is a similarsection with the locking collar backed off and with the knurled ring indicated in dotted lines.

Figure 4 IS an end elevation of the lookmg collar. I

igure 5.is a cross section taken on the line 5-5 in Figure 4.

Fi ure 6 is a side view of one-half of' the knurled ring showing the other half in dotted lines, and

. bearing which thereon soon wear out and the knurled ring Figure 7 is an edge view of one of the half rings.

Referring more particularly to the drawlngs 8 designates the printing or pinch roller and 9 designates generally the'shaft used to mount this roller in the printing press and to drive the same. This shaft consists of stepped sections which progress in size toward the printing roller 8 and the adjacent or thicker portions of the shaft indicated at 10 and 11 are provided with screw threads 12 to receive the pair of lock nuts 13 used to 1 hold the locking collar 14 in place.

This locking collar as more particularly seen in Figures 4 and 5 is constructed with an enlarged ring portion 15 constituting a s ips loosely over the threaded portion 12 of the shaft and the collar further embodies a flange 16 extending axially or at. substantially right angles to the supporting part of the collar, the flange 16 being relatively thin and having an outer beveled edge 17 which inclines from the outer wall of the flange inwardly toward the supporting part 15 ofthe collar.

' In other words the beveled edge 17 provides an overhanging edge portion which cooperates with a similar beveled edge 18 upon roller 8. The roller 8 is reduced at its ends as indicated at 19, the outside wall being cut down to a suitable depth so that the shoulder or edge 18 is provided which is beveled from the outer wall inwardly toward thecenter of the roller or, cylinder. The edge 17 of the flange 16 and the shoulder 18 of the roller thus cooperate to rovide a substantially dove-tail slot whic is annular in form and extends about the roller, one slot being at each end of the roller or near each end thereof and in these slots are received theknurled rings or other device by which the paper is gripped and pulled through the press on rotatlon of the pinch roller.

i According to the usual form these knurled rings are madeinone annular piece and consequently when the corrugations or outer peripheral roughened surface thereof wears down the entire end portion of the roller must be taken down in order to remove the rings from the roller and in fact the roller must be dismounted from the shaft to enable the rings to be taken offsaid shaft. According to the present invention these are fitted edge to edge as indicated in Figure 6 and may thus be brought together from opposite sides of the roller 8 by simply backing off the locking collar 14; for instance to the extent shown in Figure 3.

It will be noted from Figure 7 that the half sections of the knurled ring are beveled by first loosening and backing off the locking nuts13,the.dove-tail groove is enlarged sufiiciently to admit the inner base of the two sections of the knurled ring and these sections are brought together upon the roll- 'in Fi er from opposite sides thereof and the sections are held in place while the locking col lar 14: is advanced to the position indicated re 2', the locking nuts 13 being rotated to follow the collar and to secure the same tightly in place during the use of the roller in the press. lhe lock nuts will not permit of any casual movement in the locking collar or other parts and the knurled rings at the ends of the rollers will consequently be held effectually in place during the operation of the press.

It will be appreciated therefore that the delay "in changing these knurled rings is only momentary and the loss occasioned by inactivity in the press due to this cause is negligible. The convenience is greatly improved upon andthe construction and arrangement is such that the life of the shaft will be practically unlimited.

It is obvious, thatlvarious changes and modifications may be made in the details of construction and design of the above specifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claim. I

What is claimed is 1 A pinch roller for presses comprising a roller body having externally reduced end portions with shoulders between the larger surface portions of the roller body and the reduced ends, said shoulders being undercut, a collar fitted for axial withdrawal against the end of the roller body and having a flange adapted to snugly fit over the outer part of the reduced end portion of the roller body, said flange being continuous all around the roller and having its free edge portion under-cut and lying in axially spaced relation from the under-cut shoulder, and

two semicircular sections fitting together to constitute a continuous ring, the side edges of the ring being beveled to .fit within the under-cut shoulder and flange edge, said ring projecting beyond the surface of the roller body and beyond the surface of the flange.

JAMES STEPHENSON. 

